Electrocatalytic Oxygen Reduction Reaction on Perovskite Oxides: Series versus Direct Pathway

被引:76
作者
Poux, Tiphaine [1 ]
Bonnefont, Antoine [2 ]
Kerangueven, Gwenaelle [1 ]
Tsirlina, Galina A. [3 ]
Savinova, Elena R. [1 ]
机构
[1] Univ Strasbourg, UMR CNRS 7515, Inst Chim & Proc Energie Environm & Sante, F-67087 Strasbourg 2, France
[2] Univ Strasbourg, UMR CNRS 7177, Inst Chim Strasbourg, F-67070 Strasbourg, France
[3] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119991, Russia
关键词
hydrogen peroxide; kinetic modeling; perovskite oxides; oxygen reduction reaction; rotating ring disc electrode; NONNOBLE METAL-CATALYSTS; RING-DISK ELECTRODE; O-2; REDUCTION; FUEL-CELLS; PEROXIDE DECOMPOSITION; CARBON ELECTRODES; ALKALINE-MEDIUM; MECHANISM; H2O2; COMPOSITES;
D O I
10.1002/cphc.201402022
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The mechanism of the oxygen reduction reaction (ORR) on LaCoO3 and La0.8Sr0.2MnO3 perovskite oxides is studied in 1 M NaOH by using the rotating ring disc electrode (RRDE) method. By combining experimental studies with kinetic modeling, it was demonstrated that on perovskite, as well as on perovskite/carbon electrodes, the ORR follows a series pathway through the intermediate formation of hydrogen peroxide. The escape of this intermediate from the electrode strongly depends on: 1) The loading of perovskite; high loadings lead to an overall 4e(-) oxygen reduction due to efficient hydrogen peroxide re-adsorption on the active sites and its further reduction. 2) The addition of carbon to the catalytic layer, which affects both the utilization of the perovskite surface and the production of hydrogen peroxide. 3) The type of oxide; La0.8Sr0.2MnO3 displays higher (compared to LaCoO3) activity in the reduction of oxygen to hydrogen peroxide and in the reduction/oxidation of the latter.
引用
收藏
页码:2108 / 2120
页数:13
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